1195-91-1Relevant academic research and scientific papers
Synthesis of some novel chloro-/aryl-substituted-5,5-dimethyl-2-cyclohexenones
HariPrasad, S.,Jeevan Chakravarthy, A. S.,Pavan, K. P.,Venkatesh, G. B.
, (2020)
Two novel structural isomers: the dihalo-5,5-dimethyl-2-cyclohexenones were synthesized. Regioselective Suzuki-Miyaura cross coupling reaction of the isomers with nine different aryl boronic acids afforded eighteen novel compounds: the 2-aryl-3-chloro-5,5-dimethyl-2-cyclohexenones and the 3-aryl-2-chloro-5,5-dimethyl-2-cyclohexenones in 90–95% yields, which were characterized spectroscopically by IR, NMR and MS. The single crystal X-Ray diffraction ORTEP views of four representative compounds unambiguously confirm the formation of substituted cyclohexenones.
Synthesis of various cyclopropyl methyl bromide and its derivatives from ketones and/or aldehydes and some β-dicarbonyl compounds in the presence of BrCN and Et3N
Gholizadeh, Saeed,Safa, Kazem D.,Noroozi Pesyan, Nader
, p. 1239 - 1253 (2019)
The ultimate goal in this paper has been developed for the synthesis of structurally various bromomethyl cyclopropane via an α-bromoketone and/or aldehydes with ethyl cyanoacetate or malononitrile and cyanogen bromide (BrCN) in the presence of Et3N to give products in excellent yields within about 3?s. All structures were characterized by IR, 1H-NMR, 13C-NMR, and Mass spectroscopy techniques. The reaction mechanism was discussed.
Design and application of 2,2-dibromodimedone as organic brominating reagent for asymmetric bromination of 1,3-dicarbonyl compounds and ketones catalysed by chiral amino acids
Goswami, Papori,Baruah, Abhilasha,Das, Babulal
, p. 1483 - 1487 (2009)
A green and ecofriendly enantioselective a-bromination of carbonyl and 1,3-dicarbonyl compounds is reported involving the synthesis of a novel organic brominating source. The organic brominating reagent can be recovered after each cycle, rebrominated and
Synthesis of the new heterocyclic system 7,8-dihydro-6H-benzotetrazolothiadiazine and derivatives
Rezaeian, Shima,Rahimizadeh, Mohammad,Eshghi, Hossein,Bakavoli, Mehdi,Haghbin, Kamahldin,Saadatmandzadeh, Mohammad
, p. 339 - 341 (2014)
New N,N-disubstituted 7,7-dimethyl-7,8-dihydro-6H-benzotetrazolothiadiazine-9-amines were synthesized from sodium 1-amino-1H-tetrazole-5-thiolate and 2-bromo-5,5-dimethylcyclohexane-1,3-dione in multiple steps. The compounds were characterized by 13
A mild and environmentally acceptable synthetic protocol for chemoselective α-bromination of β-keto esters and 1,3-diketones
Khan, Abu T.,Goswami, Papori,Choudhury, Lokman H.
, p. 2751 - 2754 (2006)
A wide variety of unsubstituted β-keto esters can be brominated chemoselectively to the corresponding α-monobromo-β-keto esters by using a combination of vanadium pentoxide, hydrogen peroxide and ammonium bromide in a biphasic system, dichloromethane-wate
Novel Metal- and Mineral-Acid-Free Synthesis of Organic Ammonium Tribromides and Application of Ethylenephenanthrolium Bistribromide for Bromination of Active Methylene Group of 1,3-Diketones and β-Ketoesters
Dey, Rupa Rani,Paul, Bappi,Dhar, Siddhartha Sankar
, p. 724 - 736 (2015)
A novel procedure for the preparation of organic ammonium tribromides (OATBs) is described from their corresponding bromides. Quaternary ammonium bromides (QABs) and a N,N′-heterocyclic dibromide are efficiently oxidized to their corresponding monotribromides and bistribromide by m-chloroperbenzoic acid (MCPBA) in the presence of 2 and 4 equiv of KBr, respectively. The reactions are carried out in an aqueous medium without the use of any mineral acid or metal catalyst/promoters. A variety of tribromides are synthesized in very good yields including a hitherto unknown reagent, 1,10-(ethane-1, 2-diyl)phenanthrolinediium bistribromide (EPDBT). EPDBT is investigated as brominating agent and found to be highly effective for selective bromination of active methylene groups of a variety of 1,3-diketones and β-ketoesters. GRAPHICAL ABSTRACT.
A quick, mild and efficient bromination using a CFBSA/KBr system
Jiang, Pan-Pan,Yang, Xian-Jin
, p. 90031 - 90034 (2016/10/09)
Bromination is a fundamental transformation in organic chemistry and brominated compounds as building blocks are of paramount importance in organic synthesis. In our study, we have developed an efficient method of bromination by using a CFBSA/KBr system at room temperature in a short reaction time. Notably, this approach has been proven to be applicable to a range of substrates including 1,3-diketones and β-keto esters, phenols, aromatic amines and heteroarenes with good to excellent yields.
Monobromomalononitrile: An efficient regioselective mono brominating agent towards active methylene compounds and enamines under mild conditions
Pathak, Sudipta,Kundu, Ashis,Pramanik, Animesh
, p. 10180 - 10187 (2014/03/21)
The potential of monobromomalononitrile (MBM) as a convenient source of cationic bromine in organic bromination reaction has been explored. Studies reveal that MBM can be a good substitute for N-bromosuccinimide (NBS) in various respects. Enamines and act
IMINO COMPOUNDS AS PROTECTING AGENTS AGAINST ULTRAVIOLET RADIATIONS
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Page/Page column 44, (2014/01/08)
The present invention relates to compounds having the general Formula I: which absorb UV radiations and protect biological materials as well as non-biological materials from damaging exposure to UV radiations. The present invention also relates to formulations and compositions comprising such compounds for use in absorbing UV radiations and in protecting biological materials as well as non-biological materials against UV radiations.
Selective formation of spiro dihydrofurans from one-pot reaction of dimedone with BrCN and aldehydes in the presence of Et3N
Noroozi Pesyan, Nader,Shokr, Alireza,Behroozi, Mohammad,Sahin, Ertan
, p. 565 - 575 (2013/07/27)
Reaction of 5,5-dimethylcyclohexane-1,3-dione (dimedone), aldehydes and cyanogen bromide in the presence of triethylamine leads to the selective formation of spiro dihydrofurans in moderate to good yields at room temperature.
